java - Why I can't visual the String with Graphics drawString method -

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it can see pdf.png in new picture, can't see string "hello" in new picture

public void generateimage() throws exception{         int width = 220;         int height = 50;         bufferedimage image = new bufferedimage(width,height,bufferedimage.type_int_rgb);         graphics g = image.getgraphics();         g.setcolor(new color(255,255,255));         g.fillrect(0, 0, width, height);         font font = new font("宋体",font.bold,10);         g.setfont(font);         bufferedimage image2 = imageio.read(new file("data/icon/pdf.png"));         g.drawimage(image2, 0, 0, 44, 42, null);         g.drawstring("hello", 50, 5);         g.dispose();         file f = new file("data/icon/"+filename+".png");         fileoutputstream fos = new fileoutputstream(f);         imageio.write(image,"png",fos);         fos.close(); } 

g.drawstring("hello", 50, 5);

on line manipulate coordinate values, i.e. 50 , 5, , test whether text "hello" appears.


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